Ubigi’s Japan eSIM is a data-only plan on networks that include NTT Docomo, and its unlimited plans give a full-speed allowance (60GB on the 30-day plan) before dropping to 2 Mbps. Maya’s Global eSIM covers Japan and 165+ countries with unlimited data under a daily high-speed allowance, priced flat by trip length from USD 9.99.
The trap is a plan that says unlimited and then slows to a crawl halfway through the trip. Nobody flies to Japan to watch a map spin.
Ubigi’s Japan unlimited eSIM gives full speed first, then 2 Mbps
All of them follow the same pattern. You get a fixed pile of full-speed data for the whole plan, and Ubigi calls the drop to 2 Mbps its Fair Use Policy. Burn through the pile early and the rest of your days run slow.
Data-only means what it says. Ubigi’s own site says calls and texts go through messaging apps such as WhatsApp, LINE and Facebook Messenger, and that you keep your main provider and your phone number. Install is a QR code Ubigi sends by email, which you scan. Any Ubigi plan can turn your phone into a hotspot.
One more line from Ubigi’s help center: once you’ve started using a recharged data plan, it can’t be refunded.
What does unlimited data mean on a Japan travel eSIM?
Unlimited rarely means no limit: some plans cap the whole trip and then slow down, others cap each day. Maya’s unlimited data is a daily high-speed allowance, so one heavy day does not spend the rest of the trip.
Ubigi sits in the first camp. Its cap belongs to the plan, so 60GB has to stretch across 30 days. Airalo sits in the second. Its unlimited packages slow to 1 Mbps for the rest of the day once you use more than 3GB in a day, and the allowance resets every 24 hours counted from activation (Airalo, 2026). Saily publishes 5 GB per day at full 4G/5G speed, then 1 Mbps for the rest of the day. Holafly says there is no fixed limit, and its terms add that some network operators temporarily reduce speed after a certain amount of high-speed data.
Our version is the Daily Quota. All Maya plans include a daily high-speed allowance at up to 4G LTE or 5G where local networks offer it, and it resets every 24 hours. Use it all on a big map-and-video day, and tomorrow starts fresh.
Atlas is unrattled by lost luggage. A crawl in the middle of a trip is a different story.
Hotspot is included with every Maya plan at no extra cost.
How much is a Japan eSIM for a trip of 3 to 30 days?
Maya’s Global plans cost USD 9.99 for 3 days, USD 19.99 for 7, USD 27.99 for 14 and USD 49.99 for 30, flat whichever country you land in (Maya Mobile). Ubigi’s Japan unlimited plan costs US$65 for 30 days (Ubigi, 2026).
Pick your days and pay once. The 14-day plan works out to $2.00 per day, and the app marks it Most Popular. Ubigi’s shorter Japan plans are US$39 for 15 days and US$25 for 8 days.
Your home carrier has an answer too. T-Mobile’s published International Pass page lists $10 for one day with 2GB, $50 for 10 days with 15GB and $75 for 30 days with 30GB. Those are fixed bundles of data. Ours are days.
Trip runs longer than planned? Buy another plan from the Maya app and carry on.
Does a Japan eSIM also work in the other countries on your trip?
Maya’s does: one eSIM covers 165+ countries, Japan included, and the price is the same whether you’re in France or Japan (Maya Mobile). Ubigi sells its Japan unlimited plan under a Japan name, with Europe and World unlimited plans listed as separate products.
Japan is rarely the only stop. Seoul on the way over, Singapore on the way home. With a plan sold per destination, that’s a new product to find at each border.
We install one Maya eSIM and it stays on your phone permanently. You never delete it or reinstall it between trips. Each trip gets a new plan, and that’s the only thing you buy. Maya is a travel eSIM giving unlimited data in 165+ countries through that single eSIM.
Land, connect, go. Japan is just the first stamp.
What should you check before buying a Japan eSIM?
Check four things: your phone is unlocked and eSIM-capable, the plan is data-only, how “unlimited” is capped, and who runs the network. Read the terms on the cap before paying, because that is where plans differ most.
Your phone. Using Maya requires an unlocked, eSIM-compatible device. Most eSIM-compatible phones can hold several eSIM data plans at once. On iOS, the QR code method in the Maya Mobile app is marked Recommended: scan the code, tap Add eSIM or Add Cellular Plan when your phone asks, and follow the prompts. There’s also a manual activation code under My eSIMs in your account.
Data only. Ubigi’s plan is data-only. Our eSIM works alongside your existing SIM, so you keep your number. If your carrier supports Wi-Fi Calling and it’s turned on, calls and texts on your regular number run over the eSIM’s data.
The cap. Is it a plan total, a daily allowance or a speed drop? The comparison below puts each company’s own wording side by side.
The network. Japan’s major networks include NTT Docomo, KDDI/au, SoftBank and Rakuten Mobile, and the network behind a plan can matter for your itinerary (Orange Travel, 2026). HelloRoam’s 2026 guide lists Maya Mobile on au, Rakuten and docomo, and Holafly and Saily on KDDI and SoftBank.
Which travel eSIM fits a Japan trip: what each publishes on unlimited data
Every company states its own cap in its own terms: a trip total, a daily allowance or a speed drop. Ubigi’s is 60GB then 2 Mbps; Maya’s is a daily high-speed allowance that resets every 24 hours.
| Travel eSIM | How plans are sold | Unlimited plan allowance, as published | Hotspot, as published |
|---|---|---|---|
| Maya Mobile | One Global eSIM for 165+ countries, unlimited data at a flat price by trip length: USD 9.99 for 3 days, USD 19.99 for 7 days, USD 27.99 for 14 days, USD 49.99 for 30 days | A daily high-speed data allowance (the Daily Quota) at up to 4G LTE or 5G where local networks offer it, reset every 24 hours; unlimited data at standard speed once the Daily Quota is used | Hotspot and tethering included with every plan at no extra cost, where the local network allows it |
| Airalo | Per country, per region, or one global plan; priced in USD | Our unlimited data packages don’t have a fixed total data cap. However, to keep the network running fairly for everyone, when you use more than 3GB in a day, we’ll slow down (or “throttle”) your internet speed to 1 Mbps for the rest of that day. | Our unlimited data packages are designed for personal, non-commercial use. You are welcome to use your package for everyday activities like browsing, streaming, messaging, video calling and social media. |
| Holafly | Per country, per region (Europe, Latin America, Cruise plans), and unlimited monthly/annual global plans | Unlimited data means there is no fixed limit on the amount of data you can use. However, some network operators may temporarily reduce your speed after a certain amount of high-speed data usage, as explained above. | Share 1 GB of data per day with fellow travelers. |
| Saily | Per country and per region, plus one global plan; by the gigabyte, unlimited, or both | The Unlimited plan gives you 5 GB per day at full 4G/5G speed, then keeps you online at 1 Mbps for the rest of the day — fast enough for navigation, messaging, and standard browsing. | Hotspot sharing: Unlimited! Share as much of your mobile hotspot with friends and family as you want. |
| Ubigi | Europe and World unlimited plans; monthly, annual, one-off, lifetime; unlimited, 60GB then 2 Mbps | Your unlimited data plan includes 60GB of full speed data, then optimized to 2 Mbps — this Fair Use Policy ensures a stable and fair connection for all users on the network. | Use any Ubigi data plan to turn your smartphone into a hotspot. |
In the table, Airalo, Holafly, Saily and Ubigi are described in their own published wording or a brief summary of it, while the Maya Mobile row reflects Maya’s own terms.
Four of the five put a hard number on the cap. Ubigi puts it on the whole plan. Airalo and Saily put it on each day. Ours sits on each day too, and it resets every 24 hours.
How Maya keeps one eSIM on your phone for Japan and every trip after
One switch, not a store. Install Maya once, pick 3, 7, 14 or 30 days, pay one flat price from USD 9.99, and take unlimited data under a daily high-speed allowance across 165+ countries.
Each purchase is a one-time payment, and there’s no subscription and no lock-in. A plan runs for the days you chose and then stops. If you want automatic renewal, you add Auto Top-Up at checkout; it’s opt-in and off by default. Hotspot and tethering come with every plan at no extra cost.
Japan is the first stop. After that, the eSIM from this trip is already on your phone, and we recommend keeping it installed so it’s ready for the next one. The next trip is a new plan and nothing else.
FAQ
What happens after the daily high-speed allowance on Maya?
Once you’ve used the allowance, speed drops to LTE speeds with a maximum of 1Mbps upload and download for the rest of the day. Your data is never cut off entirely, and the high-speed allowance refreshes automatically every 24 hours from your activation. Speeds after the quota depend on local network conditions, and no speed is guaranteed.
Does Auto Top-Up renew my Maya plan on its own?
No. Auto Top-Up is opt-in only and off by default. If you turn it on, it buys the same plan again when the current one expires. With it off, your plan runs until it ends and stops, with no further charge.
How do calls and texts work with a travel eSIM in Japan?
Keep your home SIM in the phone: after activating a Maya eSIM, you can keep using your existing number for calls and texts. If your carrier supports Wi-Fi Calling and it’s on, those calls and texts run over the eSIM’s data connection. Data roaming must be on for the Maya eSIM to work. LINE charges for the data its calls use on a mobile network, so it recommends a flat-rate data plan (LINE Help Center).
What can you do on a slowed 2 Mbps connection in Japan?
Maps, messaging, browsing and a video call, yes; HD streaming, no. The Federal Communications Commission’s 2022 broadband guide puts general browsing and a standard video call at 1 Mbps each, and an HD personal video call at 1.5 Mbps. It puts HD video streaming at 5 to 8 Mbps. Earth SIMs’ 2026 guide puts Google Maps navigation at 5 to 10 MB per hour and WhatsApp messaging at 1 to 3 MB.
What plan covers a cruise that stops in Japan?
The Global + Cruise plan, bought as a separate purchase from the Global plan. It covers 20+ cruise lines and 165+ countries, priced on its own at USD 10.00 per day. Speeds at sea may differ from land-based coverage, and service in a specific country isn’t guaranteed and can vary for reasons outside our control.
Maya gives you one eSIM with unlimited data under a daily high-speed allowance in Japan and 165+ countries, at a flat price by trip length from USD 9.99.
